Certain sites give physical descriptions for the types, such as INFP is XYZ...Can you tell someone's type by his or her appearance? How valid could this be? The one site I can think of that does this is Socionics. A lot of people doubt it's validity, and I'm one of them. What are Socionic's strengths and weaknesses? How can its creators look at a picture of Madonna or Tommy Lee Jones and "know" that either one is ESTP?